Battery doesn't charge properly

My phone has been having a few charging problems lately. First let me list the problems that i have seen, and diagnose it as much as i can on my end.

• The battery shows the charging indicator but the percentage doesn't always increase.
• When I pull the battery the percentage changes at times-increases or decreases,but this doesn't always happen.
• The phone sometimes refuses to charge entirely, and it takes multiple tries to get it to do so.
• Also very rarely the after switching off the phone and charging it, the screen suddenly starts flickering blue-and only can be fixed by pulling the battery(Happened twice so far)
• It shows particular resistance to increase in charge,especially beyond the 70% range-its practically impossible to get it to 100%
• When I connect it to a laptop,it does get recognized and i am able to access the files on it(However there seemed to be problems when using an OTG, cant confirm ATM)
• When using the phone while charging it either discharges or remains at the same percentage,usually the former.
• Its not a software issue as i havent updated the phone in the past month, and the problems began about 2 weeks ago
• I have changed cables,power sources and tried to recalibrate the battery-none of them worked.
• The problem may or may not be connected with the following-The day before the issue started i was cleaning the phone using water.
• I did find some amount of water in the case, but it hardly was enough and none of it seemed to be there near any electrical components
• I cleaned the usb port,battery connectors, pins,and did a visual inspection, nothing seemed out of place.
• The water damage indicator of the phone seems to be normal.
• However the battery does spin-only on one end though...it doesn't spin on the other end.
• Thus i am not sure if its a sign of battery damage or just how its manufactured...I think that swelling should be universal and not discriminate between sides.
• Unfortunately i will not be able to give the phone for repair/buy stuff as i am out of town for about a week
• Also the problem is intermittent-it often reoccurs every few percentages.... and i also rebooted in safe mode to ensure that no third party apps are causing the problem. When the battery goes beyond 70-90% the charging(if any) slows drastically.

Is it just a bad battery or something more serious? Like a problem in the logic board or something?